JPS6147253A - Laminate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a laminate with excellent rigidity, heat resistance, impact resistance, and moisture resistance.

[Prior art]

Conventionally, as plastic films for packaging, inexpensive synthetic resin films such as polyolefin-based resin films and vinyl chloride-based resin films, which are inexpensive, have been used. However, these things are heat resistant,
There were problems with rigidity, etc.

Thermoplastic polycarbonate resin, which has some high rigidity and excellent heat resistance, has the above-mentioned characteristics, but on the other hand,
Moisture-proofing (2) Those that require moisture-proofing and heat resistance because they are poor or expensive resins (2) were not generally used.

[Purpose of the invention]

In view of the current situation, the present invention has excellent rigidity. have,
Heat resistant, moisture proof? It has been completed with two purposes: the polycarbonate resin layer and the olefin side resin layer are joined and integrated by coextrusion, extrusion lamination, coextrusion ξnate method, or dry lamination. 'Laminated body with Y% characteristics (two related items).

[Structure of the invention]

The invention is a laminate characterized by having at least one or two layers of a polycarbonate resin layer and a polyolefin resin layer.

In the present invention (-, polycarbonate resin layer (Al and polyolefin resin layer (B) and gA-B, A-B-A,
It is possible to laminate with j@ of B-A-B.

Also, in order to increase the adhesive strength between the laminate constituent tree) J'aPjJ (Aj layer and CB) layer or the heat seal strength t with other sheets, adhesive resin layer (CJ w is provided, A
-C-B, A-C-B-C, A-C-B-C-A,
A-C-B-C-A-C, B-C-A-C, B-C-A
-C-A%B -C-A -C-B -(, ' can be laminated in the order of 7 or more layers are also possible.The polycarbonate resin used in the invention is It is plastic, and its properties include a melting point of 180° or higher, a flexural modulus of 1.000 and 12 or higher, rigidity, and heat resistance.Also, to strengthen the adhesion with polyolefin resins, C:, any Thermoplastic resins and polycarbonate resins can be blended as long as they do not significantly impair their transparency and physical properties.

In addition, the polyolefin-based 84 resin used in the present invention is a highly moisture-proof resin such as polyethylene or polypropylene.
They can be mixed with each other as long as their properties are not impaired. Moisture-proof 8: Adhesiveness within a range that does not impair
In order to improve moldability, etc. (2.General C2) It is also possible to mix commonly used olefin modifiers, adhesive resins, etc. in any range.

In addition, the adhesive ifB fat layer (C) Y groove bottom T resin is:
Ethylene-vinyl acetate copolymer, ester of ethylene and unsaturated carboxylic acid, a-modified polyolefin resin, polybutadiene, polycrethane resin, styrene-butadiene copolymer, partial polymer of ethylene-vinyl acetate copolymer compounds, some carboxyl groups of polyolefins 2
, modified polyolefins substituted with hydroxyl groups or the like to provide adhesive properties, etc. can be used alone or as a mixture.

It is also possible to use known epoxy or urethane adhesives.

The laminate can be manufactured using the above-mentioned gfi4 resin using coextrusion method, extrusion 2 lamination method, coextrusion lamination method, and dry lamination method, but among these, each resin can be manufactured using several extrusion ayts. The coextrusion method, in which the materials are melted in a bath and joined together with a rubber band, is the most advantageous in terms of the contact force between the layers and the appearance of the sheet. This will be explained below using examples.

Example 1 Polycarbonate resin A, polypropylene resin B, and ethylene-vinyl acetate copolymer C were supplied to a laminated coextrusion film testing device in which three extruders were connected to a T-die for coextrusion, and A, C, and B were supplied in the order of A, C, and B. A film with a laminated structure was extruded, quenched in a conventional manner, and wound up. The thickness of each layer was 25μ, 10μ, and 215μ in the order of A, C, and B, respectively, for a total of 250μ.

Example 2 Polycarbonate resin A1 polypropylene resin B1 carboxylic acid modified polyprene resin C (
Mitsui Petrochemical Atmar QF 300) A, C, B
, C were laminated in this order. The thickness of each layer is 50μ and ioμ, respectively.
, 180μ, 10μ total 250μ.

Example 3 In the same manner as in Example 1, polycarbonate resin A, polypropylene resin B, and ethylene vinyl acetate copolymer C were laminated in the order of A, C, B, C, and A. The thickness of each layer is 10μ, 10μ, 210%, 10P, 1゜μ total 250
It was μ.

Comparative Example 1 A sheet having a thickness of 250 μm was prepared by melt-extruding polypropylene resin.

Comparative Example 2 Vinyl chloride resin was made into a sheet by calendering to a thickness of 2
A 50μ sheet was prepared.

Moisture proofing properties, rigidity, and heat resistance were compared using Examples 1 to 3 and Comparative Examples 1 to 2. For comparison, the molded product was molded into a capsule shape using a vacuum molding machine, and the results are shown in the table.

Moisture resistance was measured by filling a molded article with silica gel, sealing it with M foil, storing it under humid conditions, and measuring the change in weight over time.

(The weight increases when moisture is absorbed.) Rigidity was measured by applying pressure to a large part of the molded product with a finger and checking how it dented.

The heat resistance is 1 after sealing the molded product filled with water with M foil.
It was retorted at 40°C for 10 minutes, and its deformation was then examined.

Length 1 weight change Small ○ 〃　Very few　◎ A lot Δ

Claims (1)

[Claims] A laminate comprising at least one or two polycarbonate resin layers and polyolefin resin layers.